Primarily now based on BoofCV as the initial processor. Line detection mainly now through thinning, floodfill and
analysis of PixelIslands.

= PixelIsland =

A set of contiguous pixels (could enclose other islands recursively). Most routines assume that touching can be through
diagonal pixels. There is a flag for this but it's not systematic. Many islands have been thinned and therefore consist
of a graph of PixelEdges and PixelNodes (subclassed as TerminalNode and NucleusNode). (We had a lot of struggle with
different types of JunctionNode and are gradually abandoning this - it depends on the success of the thinning process).

== PixelGraph ==
Routines which extract the topology of the pixels.

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